BICYCLE WITH AUTOMATIC GEARSHIFT Russian patent published in 2010 - IPC B62M9/123 B62M25/02 F16D43/284 F16H61/28 F16H13/08 

FIELD: transport.

SUBSTANCE: invention relates to devices designed to control bicycle automatic gearshift at viscous friction variation that operate in response to change of angular speed with subsequent coupling of extra force from revolving wheel hub to make rear gearshift device operate. Spring-loaded control link is driven by front wheel hub and coupled with control link shifter operating depending upon bicycle speed variation. Said control link shifter comprises flexible links 16, antifriction ring 17, cylindrical cap 18, support element 19, constricting split sleeves 20, guide ring 21 and Newton fluid 22. Cylindrical cap 18 is fixed on axle to interact, via Newton fluid 22, with support element 19 for the latter to receive front wheel hub rotation. Support element 19 represents a washer with inner circular neck accommodating flexible links 16 connected to control element. Flexible links 16 belt guide ring 21 mounted in front wheel hub together with constricting split sleeves 20 fitted on opposite sides of control link to constrict maximum travel of control link so that to ensure operation of the rear gearshift device. Control spring rests via antifriction ring 17 on cylindrical cap 18.

EFFECT: simplified design, reduced sizes, higher accuracy and reliability.

3 dwg